int cmpAPInt(const APInt &L, const APInt &R) const;
int cmpAPFloat(const APFloat &L, const APFloat &R) const;
+ int cmpStrings(StringRef L, StringRef R) const;
+ int cmpAttrs(const AttributeSet L, const AttributeSet R) const;
// The two functions undergoing comparison.
const Function *F1, *F2;
return cmpAPInt(L.bitcastToAPInt(), R.bitcastToAPInt());
}
+int FunctionComparator::cmpStrings(StringRef L, StringRef R) const {
+ // Prevent heavy comparison, compare sizes first.
+ if (int Res = cmpNumbers(L.size(), R.size()))
+ return Res;
+
+ // Compare strings lexicographically only when it is necessary: only when
+ // strings are equal in size.
+ return L.compare(R);
+}
+
+int FunctionComparator::cmpAttrs(const AttributeSet L,
+ const AttributeSet R) const {
+ if (int Res = cmpNumbers(L.getNumSlots(), R.getNumSlots()))
+ return Res;
+
+ for (unsigned i = 0, e = L.getNumSlots(); i != e; ++i) {
+ AttributeSet::iterator LI = L.begin(i), LE = L.end(i), RI = R.begin(i),
+ RE = R.end(i);
+ for (; LI != LE && RI != RE; ++LI, ++RI) {
+ Attribute LA = *LI;
+ Attribute RA = *RI;
+ if (LA < RA)
+ return -1;
+ if (RA < LA)
+ return 1;
+ }
+ if (LI != LE)
+ return 1;
+ if (RI != RE)
+ return -1;
+ }
+ return 0;
+}
+
/// Constants comparison:
/// 1. Check whether type of L constant could be losslessly bitcasted to R
/// type.